File:Dendrocrinus caduceus fossil crinoid (Waynesville Formation, Upper Ordovician; Caesar Creek Lake's emergency spillway, northeastern Warren County, southwestern Ohio, USA) 1 (15301593062).jpg

From Wikimedia Commons, the free media repository
Jump to navigation Jump to search

Original file (709 × 976 pixels, file size: 475 KB, MIME type: image/jpeg)

Captions

Captions

Add a one-line explanation of what this file represents

Summary

[edit]
Description

Dendrocrinus caduceus (Hall, 1866) fossil crinoid from the Ordovician of Ohio, USA.

This is a rare fossil - it’s the head of the cladid crinoid Dendrocrinus caduceus (Hall, 1866). The arms have been detached, so what remains is called the cup.

Height of preserved cup = ~9.5 mm Diameter of cup base = ~2 mm Diameter of top of preserved cup = ~7 mm to ~9 mm (slightly compressed)

Classification: Echinodermata, Crinoidea, Cladida, Dendrocrinidae

Stratigraphy: float from the upper Waynesville Formation, Richmondian Stage, upper Cincinnatian Series, upper Upper Ordovician

Locality: loose piece from “flats” of Caesar Creek Lake’s emergency spillway, southwestern side, ~2/3-of-the-way between Clarksville Road & Roaring Run, northeastern Warren County, southwestern Ohio, USA.

Crinoids (sea lilies) are sessile, benthic, filter-feeding, stalked echinoderms that are relatively common in the marine fossil record. Crinoids are also a living group, but are relatively uncommon in modern oceans. A crinoid is essentially a starfish-on-a-stick. The stick, or stem, is composed of numerous stacked columnals, like small poker chips. Stems and individual columnals are the most commonly encountered crinoid fossils in the field. Intact, fossilized crinoid heads (crowns, calices, cups) are unusual. Why? Upon death, the crinoid body starts disintegrating very rapidly. The soft tissues holding the skeletal pieces together decay and the skeleton falls apart.
Date
Source Dendrocrinus caduceus fossil crinoid (Waynesville Formation, Upper Ordovician; Caesar Creek Lake's emergency spillway, northeastern Warren County, southwestern Ohio, USA) 1
Author James St. John

Licensing

[edit]
w:en:Creative Commons
attribution
This file is licensed under the Creative Commons Attribution 2.0 Generic license.
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/15301593062. It was reviewed on 6 May 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

6 May 2015

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current19:00, 6 May 2015Thumbnail for version as of 19:00, 6 May 2015709 × 976 (475 KB)Natuur12 (talk | contribs)Transferred from Flickr via Flickr2Commons

You cannot overwrite this file.

There are no pages that use this file.

Metadata

This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.

Retrieved from "https://commons.wikimedia.org/w/index.php?title=File:Dendrocrinus_caduceus_fossil_crinoid_(Waynesville_Formation,_Upper_Ordovician;_Caesar_Creek_Lake%27s_emergency_spillway,_northeastern_Warren_County,_southwestern_Ohio,_USA)_1_(15301593062).jpg&oldid=887890424"